Pilots. navigators, bombardiers and ground staff were among 14 Americans serving in the RAF and RCAF who yesterday transferred to the USAAF in London. They were: M/Segts. John M. Walton, 21, Toronto: Donald J. Vandervelden, 27. Camas, Washington, and John A. Chatet, 23. Irvington, Westchester, N.Y. : ViSers. Keith R. Suhring, 26, Wayzata, Minn. ; Francis S. Paules, 27, Lansdale, Pa.: John W. Cotton, 22, Rutherford, NJ.; Kenneth W. Hackney, 29, Bournemouth, Eng.; Leon E. Old mixon, 27, Rockville Center, N.Y.: John E. Wilkes, 35, Burlington, R 1, Joseph H. Harrison, 32, Scarsdale, N.Y.., and Eugene H. Boisvert, 26, Beverly, Mass.; S/Sge. Gilbert E. Swinburnson, 20, Wynyard, Saskatchewan; Cpls. Walter D. Korne, 22, Tampa, Fla., and James W. Dunbar, 29, Colmar Manor, Mass.